It makes a difference if you are putting it on a deck, as you suggest. Oil paint may not survive more than a year on an outdooor deck.
one used oil paint and the other used water colours
In the past oil paints referred to either petroleum based paints or linseed based paints. Today in the USA petroleum based paints are no longer sold and it is difficult to find linseed based paints though they do exist with a small proportion of linseed oil. Alkyd paints are made with synthetic oil and are readily available and have come to be known as "oil" paint.
No, it won't stick very well. However, a 100% acrylic paint will adhere very well to vinyl siding. Just insure that the paint you are using is no darker than the original color of the vinyl siding to avoid warpage.
Flake white hue doesn't contain the lead which is considered dangerous. The EU in their wisdom decided to ban flake white or cremnitz white which has now been withdrawn from art shops and from the web and the oil paint maker such as Winsor and Newton and Michael Harding have discontinued their lines in this product.
how can I tell the difference between acrylic and oil paint on my wall?
It makes a difference if you are putting it on a deck, as you suggest. Oil paint may not survive more than a year on an outdooor deck.
paint used is water, vinyl .poster oil colours
Rub it with some thinners on a rag.
Yes, you can repaint a vinyl garage door. However, you can use oil-based or latex-based paints, since they won't work. Visit your local paint store, and ask the salesperson which paint you can use on a vinyl surface.
Quite simply the materials used to paint the picture. Pigments used for painting may be, among other things, water or oil based. Generally, but not always, oil based paintings endure longer.
well old people are likely to get it (no offence to the old people though)
You will have to use a solvent. Try Goof-Off, the water based type might work and will do the least damage to the vinyl trim. All harsh solvents will damage vinyl.
one used oil paint and the other used water colours
Alkyd paint has a resin in it to help the oil in the paint dry faster, oil based paint in my opinion has a more vibrant colors, both in depth an brightness, waterbased seems to be toned down some-what. Wood paint can be either water based or oil based and even water soluble oil based. Oil based alkyd paint lately are used for things or areas that might receive abuse, and because of the slower drying time the oil based alkyd paint will show less brush marks then water based paint.
In the past oil paints referred to either petroleum based paints or linseed based paints. Today in the USA petroleum based paints are no longer sold and it is difficult to find linseed based paints though they do exist with a small proportion of linseed oil. Alkyd paints are made with synthetic oil and are readily available and have come to be known as "oil" paint.
No, it won't stick very well. However, a 100% acrylic paint will adhere very well to vinyl siding. Just insure that the paint you are using is no darker than the original color of the vinyl siding to avoid warpage.